Use the command:
&overlay overlay_name_1 shifts to x y in zone x in seconds and overlay overlay_name_2 shifts to x y in zone x in seconds
OR
@overlay overlay_name_1 shifts to x y in zone x in seconds and overlay_name_2 shifts to x y in zone x in seconds
After you’ve created the overlays using the respective commands (overlay create, scales to, opacity, to layer).